Removable jaws for rock crusher



Sept. 9, 1958 c. A. McMAl-IAN REMOVABLE JAWS FOR ROCK CRUSHER Filed Sept. 25. 1956 I N VEN TOR.

A'ITD RN EYS United States atent O REMOVABLE JAWS FOR ROCK CRUSHER Charles A. McMahan, Marion, N. C. Application September 25, 1956, Serial No. 611,982

2 Claims. (Cl. 241-300) This invention relates to a crusher, and more particularly to removable jaws or bars for crushers.

The object of the invention is to provide a crusher which is adapted to be used for crushing any desired material such as rock whereby the jaws of the rock crusher include a plurality of bars which can be readily removed or replaced when desired.

A further object of the invention is to provide a rock crusher Which includes jaws that are provided with detachably mounted bars, so that when the bars become worn or broken, they can be readily replaced without the necessity of replacing the entire jaws.

A further object of the invention is to provide rock crusher jaws which are extremely simple and inexpensive to manufacture.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this application, and in which like numerals are used to designate like parts throughout the same:

Figure 1 is a perspective view illustrating a crusher which is equipped with the jaws of the present invention. Figure 2 is a plan view illustrating one of the jaws.

Figure 3 is a sectional view taken on the line 33 of Figure 4.

Figure 4 is an end elevational view of one of the jaws, with parts broken away and in section.

Figure 5 is a fragmentary perspective view of one of the jaws showing certain of the bars detached, and with parts broken away and in section.

Figure 6 is a fragmentary perspective view illustrating a modified base.

Figure 7 is a fragmentary perspective view illustrating a modified bar for use with the base of Figure 6, with parts broken away and in section.

Figure 8 is a transverse sectional view taken through a modified bar.

Figure 9 is a view similar to Figure 8 but showing a still further modified bar.

Referring in detail to the drawings, the numeral 10 designates a portion of a conventional crusher such as a crusher which is adapted to be used for crushing rock such as the rock 12. However, it is to be understood that other materials besides rock 12 can be crushed in the machine 10. The rock crusher 10 is of conventional construction Hand includes the pair of coacting jaws 11 which are adapted to crush the rock 12 therebetween.

{lhe present invention is directed to a means for detach-ably connecting bars such as the bars to the opposed jaws 11 so that in the event that the bars 15 become worn or broken, they can be readily removed and replaced without the necessity of replacing the entire jaw.

To accomplish the present invention, each of the jaws 11 may include a base 13 which is provided with a plurality of spaced parallel grooves or slots 14, Figure 5. Arranged contiguous to a surface of the base 13 is a plurality of the bars 15, and each of the bars 15 has a rounded or arcuate outer surface 16 and a fiat inner sur- Patented Sept. 9, 1Q58 face 17 which abuts or engages the base 13. Extending inwardly from each bar 15 is a rib or tongue 18 which snugly seats in the groove 14-.

There is further provided a means for detachably connecting the bars 15 to the base 13, and this means comprises a plurality of securing elements or bolts 22. The base 13 is provided with a plurality of countersunk recesses or openings 19 which communicate with bores or openings 20 in the base 13, Figure 3. The bars 15 are provided with threaded apertures 21 which register with the bores 20. The securing elements 22 each include an enlarged head 23 which is seated in the countersunk recess 19, and each securing element 22 further includes a shank 24 which extends through the bore 29, the shank 24 being provided with a threaded end portion which threadedly engages the threaded aperture 21 in the bar 15.

From the foregoing, it is apparent that there has been provided. jaws for rock Crushers or the like which include the plurality of removable bars 15. Thus, in the event that any of the bars 15 become broken or worn out and need to be replaced, it is not necessary to replace the entire jaw, since the broken or Worn bar 15 can be easily removed by removing the securing elements or bolts 22 which hold the particular bar 15 in place. Then, the bar 15 can be replaced by a new bar so that the rock crusher can be used in the usualmanner. Due to the provision of the tongues or ribs 15 which are snugly seated in the grooves 14', the bars 15 can be easily aligned c-r positioned in the base 13 and the interfitting tongues 18 and grooves 14- help to maintain the bars in their proper position on the base 13. The bars 15 may be made of any suitable material such as hardened steel. While the present invention has been illustrated for use with a rock crusher, it is to be understood that the inventive concept is applica'ble to other types of machinery or Crushers.

Furthermore, instead of the bars 15 having the rounded surfaces 16, they may have different shapes and the parts can be made of any suitable material and in any desired size or shape. The bars 15 may be made of a suitable material such as a tough manganese nickel steel. With the present invention it is not necessary to Weld the bars 15 to the base 13 since the bars can be attached by means of the tongue and groove arrangement and by means of the bolts 22.

Thus, it will be seen that by means of the present invention the jaws, such as the jaws 11 can be rebuilt with the bars 15 so that the rebuilt jaws will cost less than new ones, and may or will outlast new jaws.

Referring to Figure 6 of the drawing there is shown a modified base which may form part of crusher jaw, and the base shown in Figure 6 is indicated generally by the numeral 25. The base 25 is provided with a plurality of spaced parallel grooves 26 which are provided with shoulders or flanges 29 that define in the grooves sections 2? and 2-3 of different lengths. In Figure 7 there is illustrated a modified bar 30 for use with the base 25, and the bar 35 includes a tongue 31 which is provided with a cutout 34 that registers with or receives the shoulder 29, the cutout 3 ldefining in the tongue 31 a pair of sections 32 and 33 which snugly fit in the sections 27 and 23 of the groove 26. Thus, the arrangement shown in Figures 6 and 7 insures that there will be no accidental shifting of the bars, and also serves to insure that the bars will be properly seated in the base.

Referring to Figure 8 of the drawings, there is shown a still further modified bar which is indicated generally by the numeral 35, and the bar 35 includes a tongue 36 which has a shank 37 extending therefrom, the shank 37 being provided with a threaded portion 38 which may be arranged in engagement with a suitable opening in the base of the crusher jaw. In Figure 9 there is shown a still further modified bar which is indicated generally by the numeral 39, the bar 39 is provided with a shank 40 which may be provided with a head that is embedded in the bar, the securing element or shank 40 being provided with an exteriorly threaded portion 42 for engagement with the base of the jaw.

Thus, it will be seen that when using the arrangement shown in Figures 6 and 7, the tongue 31 of the bar 30 fits into the groove 26, and the cutout 34 registers with the shoulder 29. Thus, accidental shifting of the bar 30 in the groove 26 is prevented. In Figure 8 there is shown a modified bar wherein the bolt 37 may be formed integral with or secured to the tongue 36, while in Figure 9 the bolt 40 may have its head 41 molded within the major portion of the bar. These bolts 37 and 46 can be used for releasably securing the bars to the base.

By means of the present invention, a purchaser need not purchase an entire base when the bars become worn, since the individual bars can be readily removed or detached from the base and then Worn bars can be readilyreplaced. The parts can be made in difierent lengths, as for example, the bars may be made in twenty foot lengths. If desired the bars can be cut and then fitted in place so that with the present invention the upkeep of the crushers will be less expensive. The provision of the shoulder 29 and cutouts 34 prevents accidental shifting of the bars in the base.

I claim: I

1. A rock crusher of the type embodying coacting jaws, each of said jaws comprising a base, said bases being each provided with a plurality of grooves, said grooves being arranged in spaced parallel relation with ,respect to each other, the ends of said grooves being spaced inwardly from the ends of said base, a plurality of bars detachably connected to said base, said bars having their longitudinal axes extending parallel with the longitudinal axes of the grooves, tongues extending inwardly from said bars and seated in said grooves, there being countersunk recesses in said base, there being spaced parallel bores in said base communicating with said recesses, said bars being provided with threaded apertures which coincide and register with said bores and recesses, and a plurality of securing elements having heads seated in said recesses, said securing elements having shanks extending through said bores and threadedly engaging the apertures in said bars.

2. A rock crusher of the type embodying coacting jaws, each of said jaws comprising a base, said bases being each provided with a plurality of grooves, said grooves being arranged in spaced parallel relation with respect to each other, the ends of said grooves being spaced inwardly from the ends of said base, a plurality of-bars detachably connected to said base, said bars having their longitudinal axes extending parallel with the longitudinal axes of the grooves, tongues extending inwardly from said bars and seated in said grooves, there being countersunk recesses in said base, there being spaced parallel bores in said base communicating with said recesses, saidbars being provided with threaded apertures which coincide and register with said bores and recesses, and a plurality of securing elements having heads seated in said recesses, said securing elements having shanks extending through said bores and threadedly engaging the apertures in said bars, each of said bars including an arcuate outer surface and a fiatinner surface.

References Cited in the file of this patent UNITED STATES PATENTS 

